You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application. The application has multiple data entry windows. Each window contains controls that allow the user to type different addresses for shipping and mailing. All addresses have the same format. You need to ensure that you can reuse the controls. What should you create?()
A. a user control
B. a data template
C. a control template
D. a control that inherits the Canvas cla
下列关于避雷针(线)接地线连接的论述正确的是()。
A. 避雷针与引下线之间的连接应采用焊接或热剂焊(放热焊接);
B. 避雷针的引下线及接地装置使用的紧固件均应使用热浸锌制品;
C. 装有避雷针的金属筒体,当其厚度不小于4mm时,可作避雷针的引下线。筒体底部应至少有2处与接地体对称连接;
D. 建筑物上的避雷针或防雷金属网应和建筑物顶部的其他金属物体连接成一个整体。